This claim seems a little odd to me. I searched more about it and found this article: https://appleinsider.com/articles/22/01/06/gen-z-survey-says... from January saying the exact same thing as this fall survey, and this article form 2020 which says it was 86%: https://nationalinterest.org/blog/techland/apple-rules-86-pe... . I can't find an estimate for teen iPhone ownership besides this company but this just seems very high to me when you account for teens without a phone as well as non-iPhones. In comparison from what I can find about half of adults own an iPhone. The fact that it is this high and stable for several years seems suspect to me.